CN107680538A - A kind of row tail control box display backlight automatic brightness regulation circuit and implementation method - Google Patents
A kind of row tail control box display backlight automatic brightness regulation circuit and implementation method Download PDFInfo
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- CN107680538A CN107680538A CN201710847452.7A CN201710847452A CN107680538A CN 107680538 A CN107680538 A CN 107680538A CN 201710847452 A CN201710847452 A CN 201710847452A CN 107680538 A CN107680538 A CN 107680538A
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- display
- backlight
- display backlight
- display screen
- control box
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- 238000005286 illumination Methods 0.000 claims abstract description 16
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- 230000002708 enhancing effect Effects 0.000 claims description 4
- 230000000007 visual effect Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000003287 optical effect Effects 0.000 abstract description 2
- 230000003137 locomotive effect Effects 0.000 description 6
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of row tail control box display backlight automatic brightness regulation circuit and implementation method,Including arm processor chip LPC4357,Display backlight driving chip TPS61165 and ambient light sensor TEPT5700,The ADC pin JA(junction ambient) optical sensor emitter stages of processor chips,Realize the collection to outside environment illumination intensity information,Outside DC 13.8V are converted to DC 26V and provide power supply for display backlight by display backlight driving chip,Arm processor chip is output to the pwm signal dutycycle of display backlight driving chip controlling switch according to the control of external environment condition illumination intensity adjustment,So as to control display backlight driving chip to be output to the backlight drive electric current of display screen,So as to adjust the backlight illumination of display screen,Beneficial effect was realized on daytime,Under the different environments such as night and tunnel,Row tail control box display backlight brightness carries out brightness regulation automatically according to different external light intensities,Driver can clearly obtain row tail control box display information and keep the good driving visual field,Ensure railway operation safety.
Description
Technical field
The present invention relates to display backlight automatic brightness regulation circuit, more particularly to a kind of row tail control box display backlight brightness
Auto-adjusting circuit and implementation method.
Background technology
The locomotive equipment in China railways goods train afterbody security protection system is mainly by train tail host and row tail at present
Locomotive platform is formed, and wherein row tail locomotive platform is mainly by the locomotive platform main frame installed in equipment room and the row tail control installed in driver's cabin
Box processed is formed.Driver is read by the button operation to row tail control box and display information realizes that the inquiry of row a tail wind pressure, auxiliary are arranged
The operation of the row tail such as wind braking and the acquisition of tail information.In the sufficient environment of daylight, row tail control box display screen needs
There is higher display backlight brightness driver can be allowed clearly to obtain display information；Environment in night and tunnel
In, row tail control box display screen, which only needs relatively low display backlight brightness, can just allow driver clearly to obtain display information,
And higher display backlight brightness can influence the driving visual field of driver.Therefore, the row tail control box display backlight of constant brightness
It is impossible to meet the driving demand under varying environment.
The content of the invention
In view of the problem of prior art is present, for the ease of driver under the different environments such as daytime, night and tunnel
Row tail control box display information is obtained, and the good driving visual field can be kept, the present invention provides a kind of row tail control box and shown
Backlight illumination auto-adjusting circuit and implementation method.Concrete technical scheme is：A kind of row tail control box display backlight brightness is automatic
Adjust circuit, including arm processor chip, display backlight driving chip and ambient light sensor；Wherein arm processor chip is adopted
With LPC4357 chips, display backlight driving chip uses TPS61165 chips, and ambient light sensor uses TEPT5700, and it is special
Sign is：The colelctor electrode pin C connection DC 3.3V power supplies of ambient light sensor, emitter stage pin E are connected to ground by resistance,
Meanwhile emitter stage pin E connection arm processor chip pin ADC0_2, arm processor chip output pin MCOA1 connections
The outside DC of the controlling switch Ctrl of display backlight driving chip, display backlight driving chip supply input pin Vin connection
13.8V powers, and power supply output pin SW and FB connect the Youda TFT-LCD display screens G043FW01V0 of locomotive platform backlight respectively
Supply input pin Power and GND, it is display screen that outside DC 13.8V power supplies are converted to DC 26V by display backlight driving chip
Backlight power supply.
Implementation method is by collection of the ADC pins of processor chips to ambient light sensor emitter voltage, is realized
Collection to outside environment illumination intensity information；Outside DC 13.8V power supplies are converted to DC 26V by display backlight driving chip
Display backlight provides power supply；Arm processor chip according to external environment condition illumination intensity, emitter voltage with intensity of illumination increasing
Raise by force, adjustment control is output to the pwm signal dutycycle of display backlight driving chip controlling switch, and control display backlight drives
Dynamic chip is output to the backlight drive electric current of display screen, and so as to adjust the backlight illumination of display screen, SW pins export to display screen
Backlight drive electric current increase, brightness of display screen enhancing；When pwm signal dutycycle reduces, the back of the body that SW pins export to display screen
CD-ROM drive streaming current reduces, and brightness of display screen reduces.
The beneficial effects of the invention are as follows：Realize under the different environments such as daytime, night and tunnel, row tail control box
Display backlight brightness can carry out brightness regulation automatically according to different external light intensities, be easy to driver clearly to obtain
Take row tail control box display information and keep the good driving visual field, preferably ensure railway operation safety.
Brief description of the drawings
Fig. 1 is principle of the invention figure；
Fig. 2 is circuit diagram of the present invention.
Embodiment
For a clearer understanding of the present invention, it is described in detail below in conjunction with drawings and examples.
As shown in Figure 1 and Figure 2, a kind of row tail control box display backlight automatic brightness regulation circuit, including arm processor core
Piece, display backlight driving chip and ambient light sensor；Wherein arm processor chip uses LPC4357 chips, and display backlight drives
Dynamic chip uses TPS61165 chips, and ambient light sensor uses TEPT5700.
The colelctor electrode pin C connection DC 3.3V power supplies of ambient light sensor, emitter stage pin E are connected to ground by resistance,
Emitter voltage raises with the enhancing of intensity of illumination.
Emitter stage pin E, PWM the control output of the ADC pin ADC0_2 JA(junction ambient) optical sensors of arm processor chip
The controlling switch Ctrl of pin MCOA1 connection display backlight driving chips；ARM processor chips pass through to ambient light sensor
The collection to outside environment illumination intensity information, ARM when external environment condition illumination strengthens are realized in the collection of emitter stage pin E voltage
Processor chips heighten the dutycycle of output pwm signal, and arm processor chip turns down output PWM when external environment condition illumination weakens
The dutycycle of signal.
The outside DC 13.8V power supplies of display backlight driving chip supply input pin Vin connections, power supply output pin SW and
FB connects the Youda TFT-LCD display screens G043FW01V0 of locomotive platform backlight power supply input pin Power and GND respectively, shows
Show that outside DC 13.8V power supplies are converted to DC 26V and powered for display backlight by backlight driving chip, display backlight driving chip
When the pwm signal dutycycle of controlling switch Ctrl inputs increases, SW pins increase to the backlight drive electric current that display screen exports, and show
Display screen brightness strengthens；When pwm signal dutycycle reduces, SW pins reduce to the backlight drive electric current that display screen exports, display screen
Luminance-reduction.
Claims (2)
1. a kind of row tail control box display backlight automatic brightness regulation circuit, including arm processor chip, display backlight driving core
Piece and ambient light sensor；Wherein arm processor chip uses LPC4357 chips, and display backlight driving chip uses
TPS61165 chips, ambient light sensor use TEPT5700, it is characterised in that：The colelctor electrode pin C of ambient light sensor connects
DC 3.3V power supplies are connect, emitter stage pin E is connected to ground by resistance, meanwhile, emitter stage pin E connection arm processor chips
Pin ADC0_2, the controlling switch Ctrl of arm processor chip output pin MCOA1 connection display backlight driving chips；Display
The outside DC 13.8V power supplies of backlight driving chip supply input pin Vin connections, power supply output pin SW and FB connect machine respectively
The Youda TFT-LCD display screens G043FW01V0 of ride backlight power supply input pin Power and GND, display backlight driving core
Outside DC 13.8V power supplies are converted to DC 26V and powered for display backlight by piece.
2. the implementation method of row tail control box display backlight automatic brightness regulation circuit as claimed in claim 1, its feature exist
In：Implementation method is by collection of the ADC pins of processor chips to ambient light sensor emitter voltage, is realized to outside
The collection of environment illumination intensity information；It is display screen that outside DC 13.8V power supplies are converted to DC 26V by display backlight driving chip
Backlight provides power supply；Arm processor chip rises according to external environment condition illumination intensity, emitter voltage with the enhancing of intensity of illumination
Height, adjustment control are output to the pwm signal dutycycle of display backlight driving chip controlling switch, control display backlight driving chip
The backlight drive electric current of display screen is output to, so as to adjust the backlight illumination of display screen, the backlight that SW pins export to display screen
Driving current increases, brightness of display screen enhancing；When pwm signal dutycycle reduces, backlight drive that SW pins export to display screen
Electric current reduces, and brightness of display screen reduces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710847452.7A CN107680538A (en) | 2017-09-19 | 2017-09-19 | A kind of row tail control box display backlight automatic brightness regulation circuit and implementation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710847452.7A CN107680538A (en) | 2017-09-19 | 2017-09-19 | A kind of row tail control box display backlight automatic brightness regulation circuit and implementation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107680538A true CN107680538A (en) | 2018-02-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710847452.7A Pending CN107680538A (en) | 2017-09-19 | 2017-09-19 | A kind of row tail control box display backlight automatic brightness regulation circuit and implementation method |
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| Country | Link |
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| CN (1) | CN107680538A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113808545A (en) * | 2021-08-23 | 2021-12-17 | 中车南京浦镇车辆有限公司 | Backlight control method for front-end destination display of metro vehicle |
| TWI833338B (en) * | 2022-08-25 | 2024-02-21 | 大陸商北京歐錸德微電子技術有限公司 | Display driving methods, driver chips and OLED touch displays to avoid interference with touch detection |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06214508A (en) * | 1993-01-19 | 1994-08-05 | Matsushita Electric Ind Co Ltd | Display device |
| CN102231263A (en) * | 2011-07-11 | 2011-11-02 | 奇瑞汽车股份有限公司 | Automobile and system and method for regulating luminance of display screen |
| CN204055837U (en) * | 2014-09-17 | 2014-12-31 | 北京市交大路通科技有限公司 | Freight train sum tail and location in transit and management imformation system |
| CN206003478U (en) * | 2016-06-21 | 2017-03-08 | 上海与德通讯技术有限公司 | A kind of backlight drive circuit and mobile terminal |
| CN207233363U (en) * | 2017-09-19 | 2018-04-13 | 天津七一二通信广播股份有限公司 | A kind of display backlight automatic brightness regulation circuit |
-
2017
- 2017-09-19 CN CN201710847452.7A patent/CN107680538A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06214508A (en) * | 1993-01-19 | 1994-08-05 | Matsushita Electric Ind Co Ltd | Display device |
| CN102231263A (en) * | 2011-07-11 | 2011-11-02 | 奇瑞汽车股份有限公司 | Automobile and system and method for regulating luminance of display screen |
| CN204055837U (en) * | 2014-09-17 | 2014-12-31 | 北京市交大路通科技有限公司 | Freight train sum tail and location in transit and management imformation system |
| CN206003478U (en) * | 2016-06-21 | 2017-03-08 | 上海与德通讯技术有限公司 | A kind of backlight drive circuit and mobile terminal |
| CN207233363U (en) * | 2017-09-19 | 2018-04-13 | 天津七一二通信广播股份有限公司 | A kind of display backlight automatic brightness regulation circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113808545A (en) * | 2021-08-23 | 2021-12-17 | 中车南京浦镇车辆有限公司 | Backlight control method for front-end destination display of metro vehicle |
| TWI833338B (en) * | 2022-08-25 | 2024-02-21 | 大陸商北京歐錸德微電子技術有限公司 | Display driving methods, driver chips and OLED touch displays to avoid interference with touch detection |
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Application publication date: 20180209 |